1 – 4
Getting Started
Operation is analogous to the Upper Limit block. Note, however,
that pressing [LL ] will increase the signed value of
V
LL
(that is,
make
V
LL
more positive); this acts to narrow the linear range of the
SIM964, rather than expand it.
The lower limit voltage
V
LL
can be set within the range:
(
V
UL
−
100 mV)
≥
V
LL
≥ −
10 V
1.2.3
Shortcuts
Pressing the two buttons [UL ] simultaneously will step the
V
UL
set-
ting between
+
10 V,
+
5 V, 0 V, and
−
5 V (each successive two-button
press steps to the next setting). This shortcut, however, cannot set
V
UL
<
(
V
LL
+
100 mV). Similarly, pressing the two buttons [LL
]
simultaneously will step the
V
LL
setting between
−
10 V,
−
5 V, 0 V,
and
+
5 V.
1.2.4
Input
The user signal,
V
i
, is input at the front-panel upper BNC connector,
which presents a 1 M
Ω
input impedance.
1.2.5
Output
The analog output,
V
o
, is available at the front-panel lower BNC
connector. Note that the SIM964 has a 50
Ω
output impedance. When
driving an external 50
Ω
user load, this will result in the output signal
being divided by 2.
1.2.6
Rear panel outputs
The two BNC connectors on the rear panel provide TTL monitor
signals for the state of the SIM964 Analog Limiter. When the upper
or lower limit is exceeded, the corresponding rear panel output is
(0 V); otherwise it idles
(
+
5 V).
SIM964
Analog Limiter
